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. 2009 Dec 28;11(1):4–18. doi: 10.3348/kjr.2010.11.1.4

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Copyright © 2010 The Korean Society of Radiology

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 8 — Artifacts on prospective ECG-triggered sequential CT scan.

A. Various degrees of stair-step artifacts derived from respiration motion are seen on coronal CT image. Artifacts are typically much more pronounced around diaphragm. Aneurysmal dilatations involving ascending aorta (AA) and pulmonary trunk (PT) are noted in 3-year-old girl with Loeys-Dietz syndrome.

B. Stair-step artifacts on prospective ECG-triggered sequential coronal CT image are remarkably decreased by applying combined ECG and respiratory triggering for same patient who underwent valve sparing aortic root replacement surgery. In contrast, difference in cardiovascular enhancement is frequently observed between adjacent slabs (arrows) due to long examination time that is further lengthened by combined triggering.